You can download DVD Decrypter 3.5.4.0 here http://fileforum.betanews.com/detail/1011845169/1 or DVDFab Decrypter 2.9.7.2 here http://www.free-codecs.com/download/DVDFab_Decrypter.htm
There may be more out there but this is the only one i know of http://www.macupdate.com/info.php/id/14414 Hope this helps